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Re: My DP8240 poes not power up. I have checked the...

If there is a standby light or indicator try unplugging the power supply and then pressing power on. Leave it unplugged for several minutes (a full 10 minutes is best) then try plugging it in a starting it again.
If there is not standby or ready light when it is plugged in try replacing the fuses in the device.
Let us know if this works or not and we can suggest some further steps.

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What I did with mine is check eBay for a 12 volt, DC LCD monitor adapter. These normally have sufficient amperage to handle these players.

I did a search on eBay today using search phrase:

"new power supply ac adapter for LCD monitor 12v 5a"

and came up with one for about $14.00 with shipping. You will need to check the plug when you get it and, if it does not fit, get one from Radio shack or, as I did, cut one from an old adapter I had laying around.

Most of these units require that the positive side goes to the center conductor of the plug (check the diagram on the player case over the plug to be sure) so make sure you set it up the way the diagram shows or very bad things will happen to your player.

You may be able to find a 12 volt adapter at Radio shack or somewhere else but these units need (according to the specs) about 1 amp from the supply to work and charge correctly. You "may" be able to get by with an 800 milliamp supply but I have not tested this.

The tray is blocked or the drive motor is stucked. Unplug and open the
player's casing and check for any obstructions and remove it. It might
be a disc or something. Check the motor if it's trying to spin. if not,
disconnect it and connect it to a 12-volt supply or lower. If it spins
then there's a problem with it's supply. Otherwise the motor should be
replaced.

Not sure, but I believe the 2.75 volts you have should be 5.0 volts.
May want to check capacitors on power supply.
The output connector on the supply may also be labeled with
the correct volatges for reference. COnstant orange light may be
indicating the +5v is low.